There's a chance that we hit our hand and end up with the suckers straight. I would put Button on two overcards or an overpair. I don't think the 55's are good. I'm not sure what SB is on, but I'm not sure he knows either. We have 6 clean outs (2 Fives and 4 3's) we'll count the 8's as only two. That gives us 8 outs. We're gettig 2:1 on our bet and we're probably 2.1:1 to make the hand by the river. With implied odds we're safe building this pot.